broken extraction/viewing fix from tarfs

[Jindrich Novy]

Hi,

this patch fixes broken extraction and displaying of symlinks from
tarfs, but possibly affects any vfs that uses vfs_s_readlink ().

To see description and steps to reproduce please see:
http://bugzilla.redhat.com/beta/show_bug.cgi?id=141065

In vfs_s_readlink () there is incorrectly calculated length of buf
instead of link name in the inode. The random size you may see when
extracting symlinks from tarfs is caused by the fact that buf is mostly
uninitialized so the link is truncated almost at random position.

-- 
Jindrich Novy <jnovy at redhat.com>, http://people.redhat.com/jnovy/
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